星尘号航天器从81P/怀尔德2号彗星捕获的有机物。

Organics captured from comet 81P/Wild 2 by the Stardust spacecraft.

作者信息

Sandford Scott A, Aléon Jérôme, Alexander Conel M O'd, Araki Tohru, Bajt Sasa, Baratta Giuseppe A, Borg Janet, Bradley John P, Brownlee Donald E, Brucato John R, Burchell Mark J, Busemann Henner, Butterworth Anna, Clemett Simon J, Cody George, Colangeli Luigi, Cooper George, D'Hendecourt Louis, Djouadi Zahia, Dworkin Jason P, Ferrini Gianluca, Fleckenstein Holger, Flynn George J, Franchi Ian A, Fries Marc, Gilles Mary K, Glavin Daniel P, Gounelle Matthieu, Grossemy Faustine, Jacobsen Chris, Keller Lindsay P, Kilcoyne A L David, Leitner Jan, Matrajt Graciela, Meibom Anders, Mennella Vito, Mostefaoui Smail, Nittler Larry R, Palumbo Maria E, Papanastassiou Dimitri A, Robert François, Rotundi Alessandra, Snead Christopher J, Spencer Maegan K, Stadermann Frank J, Steele Andrew, Stephan Thomas, Tsou Peter, Tyliszczak Tolek, Westphal Andrew J, Wirick Sue, Wopenka Brigitte, Yabuta Hikaru, Zare Richard N, Zolensky Michael E

机构信息

Astrophysics Branch, NASA-Ames Research Center, Moffett Field, CA 94035, USA.

出版信息

Science. 2006 Dec 15;314(5806):1720-4. doi: 10.1126/science.1135841.

DOI:10.1126/science.1135841

PMID:17170291

Abstract

Organics found in comet 81P/Wild 2 samples show a heterogeneous and unequilibrated distribution in abundance and composition. Some organics are similar, but not identical, to those in interplanetary dust particles and carbonaceous meteorites. A class of aromatic-poor organic material is also present. The organics are rich in oxygen and nitrogen compared with meteoritic organics. Aromatic compounds are present, but the samples tend to be relatively poorer in aromatics than are meteorites and interplanetary dust particles. The presence of deuterium and nitrogen-15 excesses suggest that some organics have an interstellar/protostellar heritage. Although the variable extent of modification of these materials by impact capture is not yet fully constrained, a diverse suite of organic compounds is present and identifiable within the returned samples.

摘要

在81P/怀尔德2号彗星样本中发现的有机物在丰度和组成上呈现出不均匀且不平衡的分布。一些有机物与行星际尘埃颗粒和碳质陨石中的有机物相似，但并不完全相同。还存在一类贫芳香族有机物质。与陨石中的有机物相比，这些有机物富含氧和氮。存在芳香族化合物，但样本中的芳香族物质往往比陨石和行星际尘埃颗粒中的相对较少。氘和氮-15的过量存在表明一些有机物具有星际/原恒星起源。尽管这些物质因撞击捕获而发生的可变改性程度尚未完全确定，但在返回的样本中存在并可识别出各种各样的有机化合物。